﻿//Copyright 2008 Kristian Gundry And Rune Juhl-Petersen
//This file is part of Plain.

//Plain is free software: you can redistribute it and/or modify
//it under the terms of the GNU Lesser General Public License as published by
//the Free Software Foundation, either version 3 of the License, or
//any later version.

//Plain is distributed in the hope that it will be useful,
//but WITHOUT ANY WARRANTY; without even the implied warranty of
//MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//GNU Lesser General Public License for more details.

//You should have received a copy of the GNU Lesser General Public License
//along with Plain.  If not, see <http://www.gnu.org/licenses/>.
using System;
using System.Collections.Generic;
using System.Text;
using System.Collections;

namespace Plain.Validation{
    /// <summary>
    /// Can validate the size of a <see cref="ICollection"/>
    /// </summary>
    public class CollectionSize:Attribute,IValidationAttribute
    {
        /// <summary>
        /// Maximum collection size. If set to 0 no max is used
        /// </summary>
        public uint Max { set; get; }
        /// <summary>
        /// Minimum collection size. If se to 0 no min is used
        /// </summary>
        public uint Min { set; get; }

        #region IValidationAttribute Members
        /// <summary>
        /// Validates a property 
        /// </summary>
        /// <param name="entity"></param>
        /// <param name="property"></param>
        /// <returns></returns>
        public bool Validate(object entity, object property)
        {
            if (property is ICollection) {
                ICollection col = property as ICollection;
                if (Max > 0 && col.Count > Max) {
                    return false;
                }
                else if (Min > 0 && col.Count < Min) {
                    return false;
                }

            }

            return true;
        }

        #endregion
    }
}
